Did I earn too much as a freelance student?

Hi,

I'm coming with a situation that I haven''t seen before when I tried to look around this subreddit.

I am a graduate school student (started in sept 2024) and started working freelance for an american company in april 2025.

I really needed the money and the fact it was remote actually allowed me to focus on my studies and work at the same time.

Now, I have a few questions about that which actually make me stressed. Will there by any issues concerning my work with an oversea employer? (I have the 28 hour work authorization but didn't create a sole proprietorship cause at first I didn't think I would be earning much).

At the end of 2025 I started earning a lot (more than $5000 in november) because I was being very efficient at the work I was doing and I was not working more than 28 hours a week. (The work was paid by the task, not the hour)

If I also have a 3.90 GPA in graduate school and I have the proof that my working speed was enough for making this salary in less than 28 hours, is there going to be any red flags?

I do want to file for taxes as accurately as I can in february, but I'm scared that earning too much will actually be an issue (to be exact, I will have earned around $23,000)

Thanks for reading and I hope I can get some clarifications